Make sure Sema::CheckIncrementDecrementOperand() removes typedefs when doing it's analysis.

Thanks to Seo Sanghyeon for his excellent (first) bug fix!

llvm-svn: 43994

clang/Sema/SemaExpr.cpp

@@ -1414,7 +1414,7 @@ QualType Sema::CheckIncrementDecrementOperand(Expr *op, SourceLocation OpLoc) {
   assert(!resType.isNull() && "no type for increment/decrement expression");
 
   // C99 6.5.2.4p1: We allow complex as a GCC extension.
-  if (const PointerType *pt = dyn_cast<PointerType>(resType)) {
+  if (const PointerType *pt = resType->getAsPointerType()) {
     if (!pt->getPointeeType()->isObjectType()) { // C99 6.5.2.4p2, 6.5.6p2
       Diag(OpLoc, diag::err_typecheck_arithmetic_incomplete_type,
            resType.getAsString(), op->getSourceRange());

clang/test/Sema/check-increment.c

@@ -0,0 +1,10 @@
+// RUN: clang -fsyntax-only -verify %s
+
+#include <stdio.h>
+typedef int *pint;
+int main() {
+   int a[5] = {0};
+   pint p = a;
+   p++;
+   printf("%d\n", *p);
+}